operators

content/Operators.md

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+---
+layout: default
+title: Operators
+nav_order: 6
+---
+
+### What are operators?
+
+Operators are symbols to tell R to perform certain mathematical operations. Think back to math class, we use `+` to indicate adding and `-` to indicate subtraction. R uses these operators and many others as well.
+
+While `+` and `-` are simple operators, functions, which are part of packages in R, are basically *very fancy* operators. We talked a bit about packages in Beginner R Part 1 but we do not talk about them today.
+
+### Guided Practice using operators
+
+##### Organize our R script
+
+In part 1 we talked about how the first step when making a new R script is to load packages we need fo our analysis. Since we will not be using packages that need to be loaded in with the `library()` command today, we can skip this step.
+
+Then, in part 1, we talked about tell R where to get the data files from your computer. Today, we are only using data sets that are already part of R, so we can just ask R for the data and R will know to look within itself to find it.
+
+``` r
+# Tell R we want the mtcars dataset today and we want to call it mt
+mt = mtcars
+```
+
+##### 
+
+##### Try out some mathmatical operators
+
+Now that we have our data and since this is a workshop I can tell you that it is formatted correctly, we can move to the fun part, data analysis!
+
+``` r
+## ADDITION 
+mt$mpg+mt$cyl
+```
+
+Note that R is working along each row when you are using operators.
+
+![](images/addition.png){width="529"}
+
+Because R is working along rows, you can create new variables in your dataset when doing calculations.
+
+``` r
+# Add variables together but when doing this, create a new variable in the mt dataset
+mt$add = mt$mpg+mt$cyl
+# get our new variable (add) to be printed in the console. 
+print(mt$add)
+#See how this is the same output as when we just ran this line mt$mpg+mt$cyl ?
+
+## DIVISION
+mt$div = mt$mpg/mt$cyl
+
+## MULTIPLY
+mt$mult = mt$mpg*mt$cyl
+
+## BRACKETS TO SPECIFY THE ORDER OF OPERATIONS
+# In English, PEMDAS is the accronym some peopel use to remember the order to calculate equations in
+  #1 Paretheses () 
+  #2 Exponent ^ 
+  #3 Multiplecation * and Division / in the order the are writen 
+  #4 Addition + and Substraction - 
+mt$pemdas = (((mt$mpg*2)/10)/mt$gear)
+```
+
+![](images/pemdas.png)
+
+The point here is not to re-hash math lessons, but to revisit why the order that we write things in is important. We all read English the same way, left to right, top to bottom. R does the same thing with the code you give it. PEMDAS is hopefully a familiar example to illustrate this point with non-English text.
+
+##### Subset our data using other operators
+
+Let's say we only want part of the entire dataset we have. This is achieved with the `subset()` command. Here are a list of operators you might use:
+
+`==` equal to
+
+`!=` not equal to
+
+`>` greater than (only works with numeric or integer variables)
+
+`>=` greater or equal to (only works with numeric or integer variables)
+
+`<` less than (only works with numeric or integer variables)
+
+\<= less than or equal to(only works with numeric or integer variables)
+
+`&` and
+
+`|` or
+
+```r
+# Create a new dataframe with only cars that have at least 5 cyclinders
+mtsub = subset(mt, mt$cyl>= 5)
+
+# Create new dataframe with cars that have a wt below 2 or over 5
+mtextreme = subset(mt, mt$wt<2 | mt$wt >5)
+```
+
+### Solo practice using operators
+
+##### Exercise #1
+
+Create a new dataframe called *mtmid* by **subsetting** *mt*. You should only keep the data that match the following criteria:
+
+1.  Have 4 cyl
+2.  qsec should be over 18
+3.  Does not have 3 gears
+
+Your resulting data should have 8 cars left:
+
+"Datsun 710" "Merc 240D" "Merc 230" "Fiat 128" "Honda Civic" "Toyota Corolla" "Fiat X1-9" "Volvo 142E"
+
+If you got this answer, great! Move on to Exercise #2
+
+##### Exercise #2
+
+Create a new variable in *mtmid* called *ex2*. Create this new variable by **dividing** the mpg by cyl and put that the the **power** of the carb.
+
+##### Answers for Exercise #1 and #2
+
+```r
+# Exercise #1
+mtmid = subset(mt, mt$cyl==4 & mt$qsec >18 & mt$gear !=3)
+
+# Exercise #2
+mtmid$ex2 = (mtmid$mpg/mtmid$cyl)^mtmid$carb
+
+```

index.md

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 ## Note: this workshop is in development and not yet complete.
 
-Description...
+If you have opened RStudio before, know what packages are, and know how to read files into R but not much beyond that, this workshop is for you! If your expertise is not at this level yet, no worries! Go over [Beginner R Part 1](https://ubc-library-rc.github.io/Beginner_R_Part1/) first.
+
+In this workshop, we will go over some operators in R and get some hands on practice using them. Then, we will work though some errors in R to learn how to go about solving errors using the operators we learned about previously. Lastly, towards the end we will go over how to customize the look of your RStudio (this is very helpful for accessibility) and how to cite R packages to give credit to the people who put in so much hard work developing them.
 
 ## Learning objectives
 
-At the end of this workshop, you will be able to:
-1.
-2.
-3.
+At the end of this workshop, you will be able to: 1. Use Operators in R 2. Fix common errors in R 3. Know how to customize RStudio and cite R packages.
 
 ## Schedule
 
-| 0:00 | Welcome and using Zoom|
-| 0:05 | Introduction |  
-| 0:15 |  |
-| 0:30 |  |   
-| 0:45 |  |
-| 1:00 | Wrap-up and Discussion |
+| 0:00 \| Welcome and using Zoom\|
+| 0:05 \| Introduction \|
+| 0:15 \| Operators in R \|
+| 0:30 \| Fixing errors \|
+| 0:50 \| RStudio Customization \|
+| 1:00 \| Wrap-up and Discussion \|
 
-## Resources
-* [eg. link to external slides]
+##